if this is the plot I think it is, i know that personally i avoided it because i had no CR with (and didn't want to get CR with) the character running it and the player often flaked on me in the past, so i didn't want to mess with it

even if it's not the same one i'm thinking of, just like you have reason to avoid this plot, other players probably had reasons to avoid yours. it doesn't necessarily mean anything terrible about you or your idea or that you shouldn't try again, just that it wasn't the right time/plot/character to do it with and people weren't engaged for whatever reason (whether that reason had to do with you or them)